package com.lxiaodd.util;


import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

/**
 *AES加密解密工具类
 *@author M-Y
 */
public class AESUtil {
      public static final String KEY = "ABCDEF0123456789";
    
      
      // 加密
      public static String encrypt(String sSrc, String sKey) throws Exception {
          if (sKey == null) {
              System.out.print("Key为空null");
              return null;
          }
          // 判断Key是否为16位
          if (sKey.length() != 16) {
              System.out.print("Key长度不是16位");
              return null;
          }
          byte[] raw = sKey.getBytes("utf-8");
          SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
          Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
          cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
          byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
          //此处使用BASE64做转码功能，同时能起到2次加密的作用。
          return new Base64().encodeToString(encrypted);
      }

      // 解密
      public static String decrypt(String sSrc, String sKey) throws Exception {
          try {
              // 判断Key是否正确
              if (sKey == null) {
                  System.out.print("Key为空null");
                  return null;
              }
              // 判断Key是否为16位
              if (sKey.length() != 16) {
                  System.out.print("Key长度不是16位");
                  return null;
              }
              byte[] raw = sKey.getBytes("utf-8");
              SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
              Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
              cipher.init(Cipher.DECRYPT_MODE, skeySpec);
              //先用base64转码
              byte[] encrypted1 = new Base64().decode(sSrc);
              try {
                  byte[] original = cipher.doFinal(encrypted1);
                  String originalString = new String(original,"utf-8");
                  return originalString;
              } catch (Exception e) {
                  System.out.println(e.toString());
                  return null;
              }
          } catch (Exception ex) {
              System.out.println(ex.toString());
              return null;
          }
      }
}
